Portion of a bathtub



FIG. 1 is a first perspective view of a portion of a bathtub showing ournew design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a third perspective view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a side elevational view thereof, the opposite side being amirror image thereof;

FIG. 6 is an elevational view of a first end thereof; and,

FIG. 7 is an elevational view of a second end thereof taken oppositeFIG. 6.

The broken lines are for illustrative purposes only and form no part ofthe claimed design.

We claim the ornamental design for a portin of a bathtub, as shown anddescribed.